bonjour
1: [- 3 x 3 -(-3)] x 2 - 3 x ( - 2 x 2-3)
= ( - 9 + 3 ) x 2 - 3 ( - 4 - 3 )
= - 6 x 2 - 3 x - 7
= - 12 + 21 = 9
2: - 3×(-2 ×2-3) = - 3 * ( - 4 - 3 ) = - 3 * - 7 = 21
3: -5×5×(-4):(-10) = - 5 * 4/10 = - 20 /10 = - 2
4: 5×(-3)-(-2)×(-1) = - 15 - ( 2 ) = - 15 + 2 = - 13
